Wristwatch



FIG. 1 is a front view of my new and ornamental design for a wristwatch;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is bottom view thereof; and,

FIG. 7 is a front perspective view thereof.

The ornamental design for a wristwatch, as shown and described.